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. 2013 Sep 9;15(9):e198. doi: 10.2196/jmir.2653

Table 2.

Comparison of the posts’ content between Time 1 and 2 (P values from Pearson chi-square).

	YouTube			Twitter
	Time 1	Time 2	P value	Time 1	Time 2	P value
Smoking initiation, n (%)	0 (0.0)	2 (22.2)	.02^a	0 (0.0)	15 (31.9)	<.001^a,b
Smoking addiction, n (%)	8 (36.4)	6 (66.7)	.12	13 (36.1)	40 (85.1)	<.001^a,b
Smoking cessation, n (%)	6 (27.3)	2 (22.2)	.77	1 (2.8)	22 (46.8)	<.001^a,b
Smoking-related disease, n (%)	17 (77.3)	4 (44.4)	.08	22 (61.1)	7 (14.6)	<.001^a,b

^aSignificant P values.

^bSignificant P values after Bonferroni-Sidak correction for multiple testing.